Nasa delays launch of satellite

A water flow problem forced the US space agency to postpone the launch of a satellite to track atmospheric carbon dioxide, a leading greenhouse gas. The Orbiting Carbon Observatory-2 was due to take off atop a Delta 2 rocket at 2:56 am Pacific time (0956 GMT) from Vandenberg Air Force Base in California. But the operation was halted 46 seconds before scheduled liftoff time due to an issue with water flow to the rocket, Nasa said.